Are you tired of guessing when to water your plants or struggling to maintain the perfect indoor environment? Meet the Apollo PLT-1 and PLT-1B, the ultimate soil moisture sensors for plant lovers and home automation enthusiasts. Built with precision and privacy in mind, these powerful little devices make it easy to care for your plants—whether you’re at home or away.
What is the Apollo PLT-1?
The PLT-1 is a compact, open-source plant monitoring sensor designed to measure:
• Soil moisture
• Temperature
• Humidity
• Ambient light (LUX)
• UV index
It connects locally to Home Assistant, giving you full control and insight without relying on the cloud. The PLT-1B adds battery power, giving you wireless flexibility anywhere in your home or greenhouse.
Smart Plant Care with Home Assistant
By integrating with Home Assistant, you can set up automations such as:
• Turn on grow lights when sunlight drops below a certain level
• Send phone alerts when soil moisture is too low
• Trigger fans or humidifiers based on humidity levels
• Automate watering based on real-time soil readings
These automations help create the ideal growing environment for your plants, even when you’re not home.
Automatically Track Ideal Conditions with Open Plant Book
Thanks to integration with Open Plant Book, the PLT-1 can pull in recommended environmental conditions for specific plants. This means:
• No more guessing how much light or moisture your plant needs
• Custom alerts and automations tailored to your plant’s exact care profile
• Better plant health with less effort
Battery or Wired: You Choose
The PLT-1B runs on a rechargeable battery, perfect for pots on shelves, balconies, or outdoor covered setups. The standard PLT-1 model can be powered via USB-C, making it ideal for permanent indoor installations.
Use Cases for the Apollo PLT-1 and PLT-1B
• Monitor indoor houseplants, orchids, succulents, and bonsai
• Optimize grow tent environments
• Automate irrigation in greenhouses or patio gardens
• Improve seedling and propagation success
• Track plant care over time with historical charts in Home Assistant
Designed for DIY and Makers
Every PLT-1 sensor is fully open-source, so you can modify the firmware or 3D-print your own enclosures. Our community often shares custom tweaks and creative uses on our Discord and forums.
Get Started Today
Whether you’re growing herbs on your windowsill or managing a complex indoor garden, the Apollo PLT-1 and PLT-1B give you the tools to succeed. With precise local data, smart automations, and community-powered support, your plants have never been in better hands.
